import * as THREE from 'https://cdn.skypack.dev/three@0.133.1';
// 该示例是创建一个向上的箭头
// 创建渲染器
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
// 在 body 节点的最后添加一个子节点
document.body.appendChild(renderer.domElement)
// 创建相机
const camera = new THREE.PerspectiveCamera(45, window.innerWidth/window.innerHeight, 1, 500)
camera.position.set(0, 0, 100);
camera.lookAt(0, 0, 0);
// 创建场景
const scene = new THREE.Scene();
// 创建材质
const material = new THREE.LineBasicMaterial({color: '#0000ff'});
// 创建带有顶点的几何体
const points = [];
points.push(new THREE.Vector3(-10, 0, 0));
points.push(new THREE.Vector3(0, 10, 0));
points.push(new THREE.Vector3(10, 0, 0));
const geometry = new THREE.BufferGeometry().setFromPoints( points );

const line = new THREE.Line(geometry, material);
scene.add(line);
renderer.render(scene, camera)